Setup:
L8 ECU with MSD closed loop chip for 55’s
071’s motorcraft gapped 0,6mm
GrpA coil

I am running this setup and it all runs very fine. Start a the first hit when cold, no misfires off or on boost and drives lovely. Only minor thing is when engine is hot and running in closed loop mode the idle revs go up and down for a little bit. Say from 900rpm up to 1000 rpm and back. Not very much but I like to have it steady.

I wounder if someone with this same setup has had the same issue and managed to solve it with a little tweak or something. For instance with a different plugs or gap, altering the basic idle rpm?